Lukaku could not walk after the game and is now a major doubt to face Stoke in the Premier League on Saturday, with Martinez confirming he will be assessed by the club's medical staff ahead of the trip to the Britannia Stadium.

"It was a very sore one. He stayed on the pitch for a period and found it really tough to open his legs," Martinez told Sky Sports.

"He had a knee right in the middle of his back and probably had a neurological reaction and found it really difficult to be able to walk.

Roberto Martinez hopes to have John Stones fit again next week

"We'll assess him. Obviously we've got a game around the corner against Stoke and we'll see if he can recover for that game.

"It was impossible for him to carry on."

Martinez insisted the hamstring injury which kept John Stones out of the match is not serious, though.

The England defender was a surprise omission and Everton boss Martinez revealed he had undergone a scan during the week.